BB Gold Bar 1oz 1 oz. Boston Bullion gold bars contain 1 troy ounce of .9999 fine gold. These bars are produced by Istanbul Gold Refinery. Each bar is in new condition, encased in plastic. In terms of cost effectiveness, these bars are a premier choice among 1 oz. size gold bars on the market today, and include an assay ensuring their purity and authenticity. They are shipped to us in brand new condition directly from the mint. You can be assured of their high quality presentation.On the front of the bar is the Boston Bullion Logo, bar weight, purity specifications and a serial number. On the rear of the encasement is an assayer signature as well as a hologram stamp of authenticity.